433,937. Turning-gear. DELCO-REMY CORPORATION, 329, East 1st Street, Dayton, Ohio, U.S.A.-(Assignees of Dyer, J. B.) Nov. 20, 1933, Nos. 30968, 30969, and 30970. Convention dates, Nov. 19, 1932, Nov. 19, 1932, and Jan. 28, 1933. [Class 7 (v)] [See also Groups XXXV and XXXVII] In a control system for an internal - combustion engine and an associated starting - motor, an electromagnet 41, controlled by the accelerator pedal or equivalent throttle element, is arranged to establish driving connection between the starting motor and the engine, and preferably also to close a switch 64 for the starting motor 20. As shown in Figs. 1 and 2, the starter pinion 30 is driven through an overrunning clutch 28 from a sleeve 26 sliding on splines on the shaft 24 of the motor 20, and is shifted into mesh with an engine gear 32 by a lever 36 having a pin-andslot connection 42, 44 with links 192, which are pivoted on a bolt 190 secured to the armature 40 of the electromagnet. This arrangement allows some movement of the armature 40 relative to the lever 36 if the engine fails to start or the motor fails to turn the engine shaft. The switch contact 64 is adapted to engage contacts 54, 56 in the circuit 52, 58 of the motor 20, and is mounted on a metal plunger 160 sliding in a core 144 and normally held by a spring 164 in the position shown in Fig. 2. Upon energization of the electromagnet, the armature 40 first shifts the starter pinion 30 into mesh with the engine gear 32, then moves the plunger 160 to close the switch 64, and finally moves the core 144 to compress a spring 174 exerting heavy pressure on the switch contact 64 to maintain proper contact. The energization of the electromagnet 40 is effected by a relay 90 on closing an ignition switch 65, one arm of which closes an ignition circuit 72 and the other closes the circuit 76 of a switch A connected to the relay 90. A rotary arm 84 on the switch A is operated from the accelerator pedal and closes the switch when the engine throttle is open ; when the engine starts, the switch A is opened by engine suction and is then held open until the closing of the throttle returns the arm 84 to its original position. The electromagnet 40 has two windings 48, 50, to which the movable contact 102 of the relay 90 is connected through a conductor 104 ; the winding 48 is connected to earth at 106 and the winding 50 is connected at 110 to the part 52 of the motor circuit. On closing the circuit of the relay 90, current passes through both coils 48, 50 and the actuation of the electromagnet closes the switch 64 ; the coil 50 is thus shunted out and the switch 64 is held by means of the coil 48 alone, which preferably has fewer turns than the coil 50, and is of higher resistance. In a modification, Fig. 4, the electromagnet 442b for shifting the starter pinion 428<b> and closing the starting-motor switch has a single winding connected to the battery 460<b> through an electromagnetic switch D shown in detail in Fig. 5. The movable contact 602 of the switch D is carried by a flat spring engaged by a rod 620 secured to a flexible diaphragm 614 and carrying the armature 618 of an electromagnet. The diaphragm 614 is movable in a casing 610, 612 connected through a flexible tube 635 to the intake manifold, a spring 638 being interposed between the diaphragm and a disc 636 having a minute orifice in order to delay the returning of the parts if the engine should stop suddenly after starting. The circuit of the electromagnet winding 608 is closed by the ignition switch 495<b> and a switch B operated by the initial depression of the accelerator pedal 487b, further depression of which moves the switch B bodily and moves the throttle valve 644. When the engine is started, engine suction acting on the diaphragm 614 separates the contacts 600, 602 of the switch D ; and the current in the electromagnet 442b is reduced by a counter-voltage set up by an enginedriven generator 498<b>, so that a very small engine suction will keep the contacts 600 602 separated when once they have been disengaged and the engine is running. The generator is of the separately excited type, the third brush being connected by a wire 506b to the wire 491b leading from a contact of the ignition switch to a fuel gauge. In a further modification, the switch D, Fig. 4, is replaced by a separate suctioncontrolled switch in series with an electromagnetic switch, and the starting-motor switch is closed by this electromagnetic switch instead of by the electromagnet 442b, Fig. 4. The Specification, as open to inspection under Sect. 91, comprises also a detailed description of the switch A, which forms the subject-matter of Specification 434,082, [Group XXXVII]. This subject-matter does not appear in the Specification as accepted.